Simulation of Unsaturated Soil Behavior by the Finite Element Method

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The mechanical behavior of partially saturated soils can be very different from that of fully saturated soils. It has long been established that for such soils, changes in suction do not have the same effect as changes in the applied stresses, and consequently the effective stress principle is not applicable. In this paper, a trial embankment on unsaturated soil was analyzed by the finite element method. A procedure was proposed to define the H-Modulus function by applying fitting methods. It depends on identifying the basic properties of the soil such as Attereberg limits and particle size distribution in order to predict the soil water characteristic curve by applying fitting methods with the aid of the program (SoilVision). Then this relation is converted to relation correlating the void ratio and matric suction. The slope of the latter relation can be used to define the H-modulus function. The finite element programs SIGMA/W and SEEP/W were used in analysis. Parametric study was carried out and different parameters were changed to find their effects on the behavior of unsaturated soil. The study reveals that the degree of saturation has a major effect on the consolidation process. The effect of degree of saturation on the behavior of unsaturated soil is apparent at early stages of consolidation and diminishes when the time proceeds. The effect of unsaturated soil on consolidation characteristics appears at early stages of loading. It was concluded that the effect of unsaturation becomes greater at the middle of the clay layer and near the center line of the embankment where more load concentrates than at its toe
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Unsaturated soil; Embankment; Finite elements; Consolidation

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M. M. M. Al-Dosary, “A Finite Element Simulation of the Behavior of Unsaturated Soil”, M.Sc. thesis, College of Engineering, University of Anbar, Iraq, 2010.

N. H. Al-Saady, “Analysis of an A-6 Soil during Construction of a Road Embankment”, M.Sc. thesis, University of Baghdad, Iraq, 1989.

D. G. Fredlund, "Unsaturated Soil Mechanics in Engineering Practice”, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 132, pp. 286 – 321, 2006.

D. G. Fredlund, and H. Rahardjo, “Soil Mechanic for Unsaturated Soils” John Wiley & Sons Inc. New York, United States of America, 1993.

D. G. Fredlund, and A. Xing, “Equations for the Soil-Water Characteristic Curve”, Canadian Geotechnical Journal, Vol. 31, pp. 521 – 531, 1994.

M. D. Fredlund, M. D., D. G. Fredlund, and G. W. Wilson, “Prediction of the Soil-Water Characteristic Curve from Grain Size Distribution and Volume-Mass Properties”, 3rd Brazilian Symposium on Unsaturated Soils, Rio de Janeiro, pp. 22 – 25, 1997.

User's Guide Manual of SIGMA/W, GEO-SLOPE International Ltd, Calgary, Alberta, Canada, 2002.

M. T. Van Genuchten, “A Closed-Form Equation for Prediction The Hydraulic Conductivity of Unsaturated Soils”, Soil Science Society of America Journal, Vol. 44, pp. 892 – 898, 1980.

S. K. Vanapalli, D. G. Fredlund, D. E. Pufahl, and A. W. Clifton, “Model for the Prediction of Shear Strength with Respect to Soil Suction”, Canadian Geotechnical Journal, Vol. 33, pp. 379 – 392, 1996.

O. C. Zienkiewicz, and R. L. Taylor, R.L. “The Finite Element Method”, sixth edition, 2006, Butterworth- Heinemann.


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